{"id":6624,"date":"2026-02-06T11:13:15","date_gmt":"2026-02-06T10:13:15","guid":{"rendered":"https:\/\/kammerer-gewinde.zold.at\/lexicon\/notch-effect\/"},"modified":"2026-04-14T17:05:15","modified_gmt":"2026-04-14T15:05:15","slug":"notch-effect","status":"publish","type":"lexicon","link":"https:\/\/kammerer-gewinde.zold.at\/en\/lexicon\/notch-effect\/","title":{"rendered":"Notch effect"},"content":{"rendered":"\n<p>The notch effect describes the local increase in stresses in a component at a point where the geometry changes abruptly, for example at a notch, a radius, a thread root, or a sharp edge. Mechanical stresses concentrate more strongly there than in the rest of the material, reducing component strength and increasing the risk of cracks or fractures. <\/p>\n\n<h3 class=\"wp-block-heading\">Why does a notch effect occur?<\/h3>\n\n<p>When a component is loaded, stresses normally flow evenly through the material. However, if this stress distribution encounters a geometric discontinuity, i.e., a notch, the stresses &#8220;pile up&#8221; and increase locally. <\/p>\n\n<p>Typical notch locations include:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Thread notches and thread roots<\/li>\n\n\n\n<li>Grooves and undercuts<\/li>\n\n\n\n<li>Bores and cross-section reductions<\/li>\n\n\n\n<li>Sharp edges or transitions without a radius<\/li>\n<\/ul>\n\n<h3 class=\"wp-block-heading\">Influencing factors<\/h3>\n\n<ol class=\"wp-block-list\">\n<li>Notch geometry: Sharp, deep notches generate significantly higher stress peaks.<\/li>\n\n\n\n<li>Material behavior: Brittle materials react more sensitively; more ductile materials can dissipate stress peaks better.<\/li>\n\n\n\n<li>Type of loading: Alternating and pulsating loads intensify the effect, especially under fatigue loading.<\/li>\n\n\n\n<li>Surface quality: Rough or damaged surfaces further increase the notch effect.<\/li>\n<\/ol>\n\n<h3 class=\"wp-block-heading\">Importance in mechanical engineering<\/h3>\n\n<p>The notch effect is particularly important for:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Thread spindles:<\/strong> The core diameter determines the permissible tensile force.<\/li>\n\n\n\n<li><strong>Shafts:<\/strong> Grooves and shoulders must be smoothly radiused.<\/li>\n\n\n\n<li><strong>Bolts:<\/strong> Fractures almost always occur at the thread root.<\/li>\n\n\n\n<li><strong>Manufactured parts under dynamic loading:<\/strong> e.g., crankshafts, axles, levers, KGT spindles.<\/li>\n<\/ul>\n\n<p>Engineers take the notch effect into account in strength calculations using the notch factor (\u03b1 or \u03b2), which indicates how severe the stress concentration is.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The notch effect describes the local increase in stresses in a component at a point where the geometry changes abruptly, for example at a notch, a radius, a thread root, or a sharp edge. Mechanical stresses concentrate more strongly there than in the rest of the material, reducing component strength and increasing the risk of [&hellip;]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"_acf_changed":false},"lexiconkategorie":[],"class_list":["post-6624","lexicon","type-lexicon","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/kammerer-gewinde.zold.at\/en\/wp-json\/wp\/v2\/lexicon\/6624","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kammerer-gewinde.zold.at\/en\/wp-json\/wp\/v2\/lexicon"}],"about":[{"href":"https:\/\/kammerer-gewinde.zold.at\/en\/wp-json\/wp\/v2\/types\/lexicon"}],"wp:attachment":[{"href":"https:\/\/kammerer-gewinde.zold.at\/en\/wp-json\/wp\/v2\/media?parent=6624"}],"wp:term":[{"taxonomy":"lexiconkategorie","embeddable":true,"href":"https:\/\/kammerer-gewinde.zold.at\/en\/wp-json\/wp\/v2\/lexiconkategorie?post=6624"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}